Pneumatic-dispatch system



1930. K. PACKENDORF 78,369

PNEUMATIC DISPATCH SYSTEM Filed April 26, 1928 fin en far M WWW-Patented Oct. 14, 1930 UNITED STATES KARL PACKENDOR-F, OFBERLIN-LICHTERFELDE, GERMANY, ASSIGNOR TO MIX 86 GENESTAKTIENGESELLSCHAFT, F BERLIN-SCHONEBERG, GERMANY, A COMPANY OF- GERMANYPNEUMATIC-DISPATCH SYSTEM Application filed April 26, 1928, Serial No.273,104, and in Germany May 6, 1927.

usefulness of such systems by enabling a single tube-line to be employedfor simultaneous trafic in both directions.

To this end according to the present invention a tube line provided withone or more switch tubes or by-pass tubes with the aid of which objectsconveyed or delivered,

such as containers for postal packets, may be carried past one anotherin oppos te directions; this makes it possible to use the line forsimultaneous two way tratfic.

One embodiment of the invention is illustrated diagrammatically and byway of example in the accompanying drawing which shows a passing pointin a tube line of a pneumatic system.

In the drawing a and 0 indicate the ends of two sections of mainpneumatic tube line. The length of tube a discharges through a switch orby pass tube 6 into the length 0' and the latter discharges through asimilar tube (Z into said length a. There is an opening 6 at theconnection between the tubes (0, b and an opening f at that between thetubes 0, (Z. These openings may be provided in the tube walls or maytake the form of interruptions separating the tube walls from oneanother. Between the point of forking g and the opening 6 the section aof main tube line contains a flap valve h and a contact device 2'. Theswitch 6 is provided with a contact device 70 and a flap valve Z- Thesection 0 of main tube line is furnished with a flap valve n and acontact device 0 between its point of forking m and the opening f whilethe switch tube cl contains a contact device ;0 and a flap valve 9 Theposition of the stops 7 shown indicates diagrammatically in whichdirection the flap valves h, n, Z, q are respectively capable of movingin the tubes.

The contact devices '5, 29 control the operatin'g fluid in-the sectionof tube line a by, for

example, regulating the action of a blower associated therewith whilethe contact devices 0, 7c similarly control the operation of a bloweracting on the section of main tube line 0. The blowing arrangementsbeing well known will not be described or illustrated in the presentspecification.

An arrow 8 indicatesthe direction of action of the operating fluid,namely compressed air, in the section of tube line a and an arrow t thedirectionthereofin the section of tube line 0.

Objects such as containers for postal packages approaching one anotherin opposite directions along the sections of tube a, 0 pass the openings6, f into the switch tubes Z), (Z. The

flap valves g, Z are kept closed by the compressedair acting thereonfrom the tube sections 4;, 0 respectively so that no obstacle ispresented to the entry of the containers into said switch tubes 5, (Z.By means of the contact devices 71, 0 which are actuated by thecontainers inpassing, the blowers are momentarily set out of operationafter which they are set in operation once more by the containerstraversing the further contact devices 70, p; said blowers are, however,now arranged to exert a suction action on the main tube sections at, cby, for example, rotating the said blowers in the opposite direction.The flap valves Z, 9 open automatically under the pressure'o'f theoutside air acting on the tubes Z), (Z

through the openings (2, f. The containers lo 'cated in said switchtubes I), (Z are therefore conveyed into the sections of main tube line0, a respectively where they continue their course. The suction in.these line sections maintains the flap valves n, it closed so that saidsuction can only act over the paths e. c and f, (Z, a but not directlyover f, c or e, a and thus exerts its full power in the tubes 6. (Z.

A carrier that under the action oi? the compressed air has passed beyondthe flap valve h or n cannot be returned to the station whence itarrives, because the suction then produced will close the flap valves h,n and thus prevent the suction from acting in the tube portions,

he or af. These portions can be made so long that it shall be suflicientto insert the carriers about the same time, or nearly so, if the tubes5, (Z are located in the middle of the transit tube. Or the tubesections a, c may each contain an arresting device, these devices beingequidistant from the tubes 12, d are not I only getting retracted fromtheiroperative position if both are acted upon by each a carrier or aseries of carriers. Inthis Way it can be avoided that the carriers mustbe dispatched simultaneously or'at a proper time. Such arresting devicesare not shownsince not being necessary to perform the invention.

What is claimed is:

tubes Which interconnect these sections to enable conveyance to takeplace in both direc tions simultaneously.

, 2. In a pneumatic dispatchsysteni,'atin V gle tube line consist ng-oftwo sections, two tubes interconnecting these i sections, and.

means for reversing the direction in Which the propelling air ismoving.v V v In apneumatic dispatch system, a sin- ,gle tubelineconsisting oftWo sections, two

tubes interconnecting these sections, means for reversing. the directionof travel of the propelling air, and means for closing the said Iinterconnectingtubes against the tube sections to whichthey respectivelydeliver, these air action. 7

means being efiicient until the reversal of the 4- In a pneumaticdispatch system, a single tube line consistingoftwosections, twotubesinterconnecting these sections, means for reversing the dlrecti'on-oftravel of the propelling air, such means governed by the carriers,

and means for Glslhg: the sald interconnecting tubes against'the tubesections to which they respectively deliver, these means beingefii'cient until the reversalof the air action.

In a pneumatic dispatch system, a single tube line consisting of twosections, two tubes v interconnecting these. sections, air passagesbeing provided between either of these 1 sections and theinterconnecting tube forming.

the continuation thereof, and meansfor reversing the direction of travelof the propel.-

. ling air.

'- 6. in a continuation thereof. 7

KARL PAC KENDQRFi 7 1 In a pneu'maticdispatch system, a'single Ytube-lineconsistingof tWo' sections, and'two

